IS 25 too old to become a titled player?

More seriously, I dont think they are commensurable. Your online score depends very much on how much time you spend per move. Do you break out a board, and move the pieces around, and take 30-60 minutes on a move? Or do you look at the screen for a minute and pick something that looks ok? Do you keep to under 5 games, or do you play 35 at a time?

I started online as training for OTB games, to solve a particular problem: a tendency to move in OTB without adequately considering opponent responses. I figured online was a good way to punish me over and over until I became more careful. And I stay away from blitz because that only encourages what I am trying to avoid.

let me clarify, the players that I'm playing that are at 2200 level online feel like 1800-2000 level players OTB. I'm playing a couple of players now that probably are masters or at master strength, but over the past few months, most of the players zI've played I feel like they're about 200 points lower that what is listed.

This is a common experience, but there are 1500s here who play as well as masters (perhaps assisted), and I know at least one strong correspondence player (2300+) who has an old USCF of ~1500 and recently returned to OTB play.

Efforts to correlate the two rating pools are fraught with difficulty.

Really, it's about how much time you put into it. Honestly, it wouldn't surprise me to see more people who become highly ranked players later in life-as you grow older, some of your time committments disapear (no more school, as you reach retirement age there might be less work, children are grown and don't need the care they used to, etc) and there's more time for things like chess.

Also a miracle could happen and my health could get better and I could up my USCF rating from 2188 to 2200 and I am age 71. Maybe I could get a expert or master to play me at my home. Or maybe I could find a tournament director from long ago. Possible.